First problem is the Razer Synapse software and its insistence on installing numerous different background services, despite me unchecking everything but the core app during installation. Regardless, once it was installed, my firewall started going crazy with multiple different apps and services trying to gain internet access. Even worse, you could tell by their names, some of them were trying to tie into my Steam software, internet browsers, etc. This is unacceptable since I (the paying customer) chose to unselect everything during install but the 1 single core Synapse app to customize the mouse. They never disclosed anything and I certainly never agreed to their software trying to interface with all this other software on my PC. But, I could have lived with that since, once you customize the mouse, the settings are stored in its onboard memory and it would then be possible to uninstall the Razer software. Or at least try to... I haven't yet so I'm unsure if it actually does remove the plethora of files and services it created. However, what I can't live with are hardware defects with the mouse and the lack of product support from Razer. There isn't enough room in this review to list every problem so I'll just mention the main one. About 10 percent of the time, upon booting or waking my PC, the mouse will be non-functional and I must unplug/replug it to regain function. I've tried it in multiple USB ports, both 2.0 and 3.0 and it still happens. Note that I've used many other mice on this PC over the years (Logitech, Roccat, etc) and never experience this problem with any of them. Contacted Razer support and the rep obviously had never been trained on the product line. He didn't even have knowledge of basic features. So, after wasting half an hour with him just trying to make him understand the problem and, indeed, trying to teach him about his own company's product, he finally acknowledged that he would need to escalate the ticket to a product expert. And guess what, no one ever got back to me. I suspect they know its a defect but Razer is one of those companies that try to avoid customers with a defective product and hope they just go away so they don't have to deal with a warranty claim. But, guess what Razer, what happens instead is I post this 1 star review about your bad product / support and contact Target to return it as defective anyway!

The Razer Synapse software that is required in order to use this mouse is absolute garbage. The mouse is good. But because the software is so bad, I can't recommend this mouse.